New Solar Cell Process Achieves Record Efficiency, MIT Says

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Researchers at the Massachusetts Institute of Technology (MIT) say they have achieved a major breakthrough in the conversion of sunlight into electricity, surpassing what was long believed to be an absolute limit to the efficiency of solar cell devices.

While the process used in the typical photovoltaic (PV) cell process knocks loose one electron inside the PV material to produce an electrical current — but wastes any excess energy carried by a photon — a new process described in the journal Science utilizes that extra energy to produce two electrons. That exploits so-called singlet exciton fission and makes the process far more efficient, creating more electrical energy.

An exciton is the excited state of a molecule after absorbing energy. While the material used in the organic solar cell, known as pentacene, was previously known to produce two so-called excitons from one photon, researchers say this is the first time anyone has demonstrated the principle within a photovoltaic device. While the typical solar panel achieves efficiencies no greater than 25 percent, the scientists believe this process can be utilized to achieve efficiencies of more than 30 percent.

Article appearing courtesy Yale Environment 360.

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Yale Environment 360 is an online magazine offering opinion, analysis, reporting and debate on global environmental issues. We feature original articles by scientists, journalists, environmentalists, academics, policy makers, and business people, as well as multimedia content and a daily digest of major environmental news. Yale Environment 360 is published by the Yale School of Forestry & Environmental Studies and Yale University. We are funded in part by the Gordon and Betty Moore Foundation and by the John D. and Catherine T. MacArthur Foundation. The opinions and views expressed in Yale Environment 360 are those of the authors and not of the Yale School of Forestry & Environmental Studies or of Yale University.

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